Dynamical Faraday rotation effects of sol-gel derived Al2O3-SiO2 glass containing Eu2+ ions

被引：26

作者：

Hayakawa, T ^{[1
]}

Nogami, M ^{[1
]}

机构：

[1] Nagoya Inst Technol, Dept Mat Sci & Engn, Nagoya, Aichi 4668555, Japan

来源：

SOLID STATE COMMUNICATIONS | 2000年 / 116卷 / 02期

关键词：

disordered system; sol-gel; magnetic cluster; Faraday rotation;

D O I：

10.1016/S0038-1098(00)00282-9

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The optical and magnetic characterizations of Eu2+-doped Al2O3-SiO2 glass, which was synthesized by a sol-gel technique, were performed on the basis of absorption-fluorescence spectra, a dynamical Faraday rotation, a static magnetic susceptibility, and an electron paramagnetic resonance (EPR). The dynamics of Faraday rotation in pulsed magnetic fields revealed the formation of anti-coupled Eu2+-O-Eu2+ magnetic pairs at low temperature, as well as two contributions to the total rotation: a paramagnetic due to Eu2+ ions and an antimagnetic presumably due to Al-associated defect centers generated by H-2-impregnation. The broad feature around g similar to 2.00 in the S-state EPR spectra implied a multi-site distribution of Eu2+ ions in Eu,Al-rich phase produced in the sol-gel transformation. The influence of Al2O3 On the aggregation of europium ions in a SiO2 network was discussed. (C) 2000 Elsevier Science Ltd. All rights reserved.

引用

页码：77 / 82

页数：6

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